package com.sinosoft.sm.system.common.utils;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;
import org.apache.commons.lang3.StringEscapeUtils;

/**
 * 封装各种格式的编码解码工具类
 * 1.Commons-Codec的 hex/base64 编码
 * 2.自制的base62 编码
 * 3.Commons-Lang的xml/html escape
 * 4.JDK提供的URLEncoder
 * @author xiaoxiong
 *
 */
public class EncodeUtil {

	private static final String DEFAULT_URL_ENCODING = "UTF-8";
	private static final char[] BASE62 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".toCharArray();
	
	/**
	 * Hex编码
	 */
	public static String encodeHex(byte[] input) {
		return Hex.encodeHexString(input);
	}

	/**
	 * Hex解码
	 */
	public static byte[] decodeHex(String input) {
		byte[] result = null;
		try {
			result =  Hex.decodeHex(input.toCharArray());
		} catch (DecoderException e) {
			e.printStackTrace();
		}
		return result;
	}
	
	/**
	 * Base64编码
	 */
	public static String encodeBase64(byte[] input) {
		return Base64.encodeBase64String(input);
	}

	/**
	 * Base64编码, URL安全(将Base64中的URL非法字符'+'和'/'转为'-'和'_', 见RFC3548)
	 */
	public static String encodeUrlSafeBase64(byte[] input) {
		return Base64.encodeBase64URLSafeString(input);
	}

	/**
	 * Base64解码
	 */
	public static byte[] decodeBase64(String input) {
		return Base64.decodeBase64(input);
	}
	
	/**
	 * Base62编码
	 */
	public static String encodeBase62(byte[] input) {
		char[] chars = new char[input.length];
		for (int i = 0; i < input.length; i++) {
			chars[i] = BASE62[((input[i] & 0xFF) % BASE62.length)];
		}
		return new String(chars);
	}
	
	/**
	 * Html转码
	 */
	public static String escapeHtml(String html) {
		return StringEscapeUtils.escapeHtml4(html);
	}

	/**
	 * Html解码
	 */
	public static String unescapeHtml(String htmlEscaped) {
		return StringEscapeUtils.unescapeHtml4(htmlEscaped);
	}

	/**
	 * Xml转码
	 */
	public static String escapeXml(String xml) {
		return StringEscapeUtils.escapeXml(xml);
	}

	/**
	 * Xml解码
	 */
	public static String unescapeXml(String xmlEscaped) {
		return StringEscapeUtils.unescapeXml(xmlEscaped);
	}

	/**
	 * URL编码, Encode默认为UTF-8
	 */
	public static String urlEncode(String part) {
		String result = null;
		try {
			result =  URLEncoder.encode(part, DEFAULT_URL_ENCODING);
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return result;
	}

	/**
	 * URL解码, Encode默认为UTF-8
	 */
	public static String urlDecode(String part) {
		String result = null;
		try {
			result =  URLDecoder.decode(part, DEFAULT_URL_ENCODING);
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return result;
	}
}
